KR101090952B1 - Measurement and Calibration Device of Fluid Vibration Flow Measurement System and Its Method - Google Patents

Abstract

The present invention relates to a measurement correction device and a method of a fluid vibration flow rate measuring device.
According to the present invention, a fluid supply device for supplying a fluid through a pipe, a fluid vibrator for generating a unique vibration frequency when the fluid supplied from the fluid supply device passes, and a passage of fluid passing through the fluid vibrator Electronic valves for controlling the amount and shutoff, a reference tank for accumulating and storing the fluid passing through the electronic valve, the fluid passage time obtained from the fluid vibrating body, the vibration frequency, the set passage flow rate of the electromagnetic valve, the reference tank A measurement correction device and a method of a fluid vibration type flow measurement device including a computer device for calculating and storing the intrinsic linear correction coefficient of the fluid vibrating body based on the information of the set accumulation amount of the present invention.

Description

A calibration method for a fluid vibration measuring device and a method thereof {A compensation method for measurement of a fluidic oscillation type flow meter}

The present invention relates to a measurement correction device and a method of a fluid vibration flow rate measuring device. More specifically, in the molding of an injection molding product, the fluid vibrating body manufactured to realize the inconsistency of the measured value and the fluid vibration method due to the characteristics of the meter made by using the fluid vibration method among the meter measuring the flow rate of the fluid An apparatus and a method for correcting inconsistency of measured values due to the deformation of the frame generated in the present invention.

The flow meter uses the vibration of the fluid jet, and the fluid injected into the jet exits the jet outlet and the pressure drops, and the fluid flows along the wall due to the pressure drop. This phenomenon is called a Coanda effect.

If the fluid flowing through the wall makes the path of the fluid so that a part of the fluid flows back to the jet inlet by the internal structure, the fluid flowing through the wall collides with the fluid flowing through the wall, thereby obstructing the direction of the ejected fluid. The jet of fluid will vibrate. At this time, the period of oscillation is proportional to the flow rate of the fluid flow, and the value of the flow rate can be determined using this proportional value. This principle is called fluid oscillation, and the form made up of this method is called fluid oscillator.

The fluid vibrating body is composed of a jet nozzle for strongly injecting the fluid, a feedback passage for flowing the wall back to the jet nozzle according to the Coanda effect after the pressure is jetted, and an obstacle to help the vibration of the injected fluid. do.

In order to analyze the fluid oscillation cycle according to the flow rate, the fluid must be a regular laminar flow. Reynolds number analysis is used to determine whether this flow is stable. The boundary value at which turbulence begins to be called the critical Reynolds number. This phenomenon can produce a fluid vibrating body having a condition exceeding a threshold value depending on the molding environment (pressure, temperature, humidity, etc.) of the injection molding even in a fluid vibrating body designed to stabilize the laminar flow. There is a problem that data values measured at the same flow rate passing through such a fluid vibrating body are different.

In addition, due to the characteristics of the meter made by using the fluid vibration method as described above, when the fluid passing through the meter changes in the magnitude of the linear flow rate, the fluid vibration frequency is changed according to the flow rate change, so that the measurement data is detected as nonlinear data and is fixed. There is a problem that can not be measured by the proportional value.

Accordingly, there is a need for a flow measuring device and a method thereof, which enables consistent measurement at all times despite a problem caused by a fluid vibrating body having a condition exceeding a threshold in a fluid vibration type flow measuring device and a change in the fluid vibration frequency according to the flow rate change. .

The present invention is to solve the problems of the prior art, the object of the present invention is a fluid vibration type flow measuring device, the inconsistency and flow rate change of the flow rate measurement caused by the fluid vibrating body used in the flow measuring device The present invention provides a flow rate measuring device and a method for performing a consistent flow rate measurement by correcting the inconsistency of the flow rate measurement due to the change of the fluid vibration frequency.

As a technical solution for achieving the object of the present invention, in the present invention, the flow rate comprising a fluid tank and a pump that can be sent through the pipe by adjusting the amount of flow rate to the fluid vibrating body for implementing the fluid vibration method step by step A supply device, a fluid vibrator for measuring the flow rate through the pipe, a vibration frequency detector for detecting the fluid vibration frequency generated when the fluid passes from the fluid vibrator, and a flow rate supplied through the pipe An electronic valve for controlling the valve, a valve control device for controlling the driving of the electronic valve, a reference tank for accumulating and storing the fluid flowing through the electronic valve, and for checking the fluid accumulation amount of the reference tank A level meter device and a cumulative amount set by the level meter device are detected to receive and transmit a signal A valve control unit for transmitting a cutoff signal to a control device, and a cumulative amount of the reference tank received from the level meter device, a fluid passage time of the accumulated amount, and vibration frequency data detected from the fluid vibrating body from the vibration frequency detection device. A calculation unit for receiving and calculating the intrinsic linear correction coefficient of the fluid vibrating body, a storage unit for storing the intrinsic linear correction coefficient calculated in the calculation unit in association with the fluid vibrating body information, the calculation unit and the valve A measurement correction apparatus for a fluid vibration type flow measurement device including a computer device including a control unit for controlling the control unit and a measurement correction method using the device are provided.

According to the present invention, in the fluid vibration flow rate measuring apparatus, the inconsistency of the flow rate measurement generated by the fluid vibrating body used in the flow measuring device and the inconsistency of the flow rate measurement by the change of the fluid vibration frequency according to the flow rate change It is effective to make consistent flow rate measurement by calibrating.

1 is a schematic configuration diagram of an embodiment of a measurement correction device of the fluid vibration type flow measurement device of the present invention.
Figure 2 is a flow chart for explaining an embodiment of the measurement correction method of the fluid vibration flow rate measuring apparatus of the present invention.

Hereinafter, with reference to the accompanying drawings, the configuration of the invention of the embodiment of the present invention will be described in detail.

In order to facilitate understanding of the embodiment of the present invention, a description will be given of the fluid vibrating body of the flow measuring device used in the fluid vibration method. In particular, the sensitive fluid jet generating part may deform from the intended shape by causing each fluid vibrating body to deform during injection molding of the fluid vibrating body. In this case, the determined fluid frequency is deformed according to the flow rate by experimental data of the fluid vibrating body, which causes a lot of errors in measuring the flow rate. It is known that the smaller the magnitude of the flow rate in the measurement by the fluid vibrating body, the lower the accuracy.

The critical point from laminar to turbulent in the flow of fluid is the Reynolds number of approximately 2000 to 2800 or more. The formula for measuring the flow rate at which the fluid turns into turbulent flow is as follows.

Where

Critical Reynolds Numbers = 2500

Kinematic viscosity = (1.007 x 10 ⁶ ) ㎡ / s

Fluid passage cross section diameter = typical household water supply = 15 mm

In this case, the flow rate is calculated to be about 0.136 m 3 / h, which means that it occurs from less than 0.136 m 3 per hour when analyzed. In addition, it is known that the change in the cross-sectional area of the flow jet generating unit shows a large difference in the vibration frequency generated by the change of 0.01 inch.

1 is a schematic configuration diagram of an embodiment of a measurement correction device of the fluid vibration type flow measurement device of the present invention.

As shown in Figure 1, the measurement correction device of the flow measurement device of the present invention, the fluid tank 110 that can be sent through the pipe by adjusting the flow rate step by step to the fluid vibrating body for implementing the fluid vibration system And a fluid supply device 100 including a pump 120, a fluid vibrator 200 for measuring a flow rate through a pipe, and a fluid vibration generated when a fluid passes from the fluid vibrator 200. Vibration frequency detection device 210 for detecting a frequency, an electronic valve 300 for controlling the flow rate supplied through the pipe, and a valve control device 310 for controlling the driving of the electronic valve 300 And a reference tank 400 for accumulating and storing the fluid flowing through the electromagnetic valve 300, a level meter device 410 for checking the cumulative amount of the fluid in the reference tank 400, and the level meter. The cumulative amount set in the device 410 The cumulative amount and the cumulative amount of the valve control unit 510 for receiving the detected and transmitted signal and transmitting the cutoff signal to the valve control device 310, and the reference tank 400 received from the level meter device 410. Correction coefficient calculation unit for calculating the intrinsic linear correction coefficient of the fluid vibrating body 200 by receiving the fluid passing time of the vibration vibration frequency data detected from the fluid vibrating body 200 and the vibration frequency detection device 210 520, a storage unit 530 for storing the intrinsic linear correction coefficient calculated by the correction coefficient calculator 520 in association with the information of the fluid vibrator 200, and the correction coefficient calculator 520. And a control unit 540 for controlling the valve control unit 510.

The measurement target fluid stored in the fluid storage tank 110 is transferred to the pipe by the driving of the pump 120. The conveyed fluid passes through the fluid vibrator 200, and at this time, vibration occurs in the fluid passing through the fluid vibrator 200 and a unique vibration frequency is generated according to the flow rate. The vibration frequency detection device 210 detects the vibration frequency generated by the fluid vibrator 200 and transmits the vibration frequency to the correction coefficient calculator 520 of the detection device 500. The fluid passing through the fluid vibrator 200 passes only the set flow rate controlled by the electronic valve 300. The fluid passing through the electronic valve 300 is accumulated and stored in the reference tank 400. The level meter device 410 checks the amount of fluid accumulated in the reference tank 400, and when the accumulated amount of fluid reaches the set amount, the level meter device 410 is transferred from the level meter device 410 to the computer device 500. Send the signal. On the basis of the signal transmitted from the level meter device 410, the valve control unit 510 of the computer device 500 transmits a valve shutoff signal to the valve control device 310 and controls the valve control device 310. By the electromagnetic valve 300 is blocked. The electronic valve 300 is shut off and the linear coefficient of correction unique to the fluid vibrator 200 is calculated by the correction coefficient calculator 520 according to a control signal of the controller 540 of the computer device 500. Store in the storage unit 530.

The reference tank 400 may use, for example, a tank such as a 100 l tank having an error range of ± 0.05%.

Calculation of the intrinsic linear correction coefficient of the fluid vibrator 200 includes the time at which the flow rate of the fluid vibrator 200 passes, the flow rate set in the electromagnetic valve 300, and the reference tank 400. A standard hourly flow rate determined by calculating the cumulative flow rate is calculated, and the intrinsic linear compensation coefficient of the fluid vibrating body 200 is calculated and stored based on the fluid vibration frequency generated when the fluid vibrating body 200 passes.

In the above-described method, the linear correction coefficients of the fluid vibrating bodies 200 for each step are calculated and stored through the same process described above while increasing by 0.001 m 3 / h in steps from the minimum flow rate to the critical flow rate.

In addition, in the same manner, while increasing to an excess flow rate of the world water meter 15mm standard by 0.1 m 3 / h unit, the intrinsic linear correction coefficient of the fluid vibrating body 200 is calculated and stored through the same process as described above.

When finally assembling the fluid measuring device composed of the fluid vibrating body 200, a unique linear correction coefficient for the natural vibrating frequency of the fluid vibrating body 200 is found in the storage unit 530 to provide the fluid measuring device. Apply.

The process of calculating the inherent linear correction coefficient of the fluid vibrator 200 will be described in more detail.

First, for example, a general household water pipe, for example, oscillating the vibration frequency according to the 15mm standard once per second, that is, the vibration period is about 0.06 m 3 / h at 1000 msec, 0.135 m 3 / it belongs to a nonlinear distribution band within about 50% of h.

In other words, the non-linear distribution from the reference oscillation cycle flow rate 0.06 m3 / h up to 0.016 m3 / h (the world's water meter 15 mm standard minimum flow rate) and the maximum flow rate of 0.135 m3 / h, the critical maximum expected flow rate, are 0.001 m3 / h. The period is measured by subdividing the unit, and the measurement period is multiplied by the number of generation cycles generated for a predetermined time, and then the measured value is divided by the accumulated value of the flow rate contained in the reference tank 400.

In this way, the linear correction coefficient is determined up to the critical anticipated maximum flow rate, and then the linear correction coefficient is calculated in the same way up to 2.5 m3 / h, which is an excess of 15 mm standard water meter in world water meters, in units of 0.1 m3 / h.

This allows each fluid vibrating body to have a stable linear correction coefficient that falls within a range of ± 5% error below the critical predicted flow rate and a ± 2% range above the critical predicted flow rate based on a 15 mm standard for water meters in the world. It is possible to minimize the defective rate for molding deformation caused by the sieve injection.

Figure 2 is a flow chart for explaining the measurement correction method of the fluid vibration flow rate measuring apparatus of the present invention.

Measurement correction method of the fluid vibration system flow measurement device of the present invention, the step of supplying the fluid through the pipe in the fluid supply device (S100), and is generated when the fluid supplied from the fluid supply device passes through the fluid vibrating body Detecting the vibration frequency in the vibration frequency detection device (S102), transmitting the detected vibration frequency in the vibration frequency detection device to the computer device (S104), and the fluid that has passed through the fluid vibrating body to the electromagnetic valve. Controlling to pass at the flow rate set in step (S106), storing the fluid passing through the electromagnetic valve in the reference tank (S108), and checking the fluid accumulation amount of the reference tank in the level meter device in a set amount. Transmitting a detection signal to the computer device (S110) when the detection signal is detected and receiving the detection signal of the level meter device from the computer device. A standard hourly flow rate determined by calculating a step (S112) of shutting off the child valve and calculating a time at which the flow rate of the fluid vibrating body passes through the computer device, a passage flow rate set in the electronic valve, and a cumulative flow rate set in the reference tank are calculated. Calculating (S114), calculating a linear correction coefficient inherent in the fluid vibrating body based on the fluid vibration frequency generated when the fluid vibrating body passes through the computer device (S116), and in the computer device, And storing the calculated unique linear correction coefficient of the fluid vibrating body in the storage device (S118).

The measurement correction method of the flow rate measuring apparatus of the present invention is obtained by subdividing the unit linear flow coefficient in the range of the reference flow rate and the critical expected maximum flow rate from the electromagnetic valve to obtain the intrinsic linear correction coefficient of the fluid vibrating body for each step by the above-described method. do.

The measurement and correction method of the flow rate measuring device according to the present invention includes the fluid vibrating body stored in the computer apparatus based on the vibration frequency of the fluid vibrating body when the flow measuring device including the fluid vibrating body is configured. Search for the inherent linear correction coefficient of the applied to the flow measuring device.

100: fluid supply device
200: fluid vibrating body
300: solenoid valve
400: reference tank
500: computer device

Claims (7)

A fluid supply device for supplying a fluid through a pipe,
A fluid vibrating body generating a unique vibration frequency when the fluid supplied from the fluid supply device passes;
Electronic valves for controlling the passage and blocking of the fluid passing through the fluid vibrating body,
A reference tank for accumulating and storing the fluid passing through the electromagnetic valve;
Computer apparatus for calculating and storing the intrinsic linear correction coefficient of the fluid vibrating body based on information of the fluid passage time obtained from the fluid vibrating body, the vibration frequency, the set passage flow rate of the electronic valve, the set accumulation amount of the reference tank Measurement and correction device of the fluid vibration system flow measurement device comprising a. The method according to claim 1,
Measurement correction device of the fluid vibration flow rate measuring apparatus,
Means for causing the fluid supply device to supply a flow rate step by step;
Vibration frequency detection device for detecting the vibration frequency generated in the fluid vibrating body,
And a level meter device for detecting a cumulative amount of fluid set in the reference tank. The method according to claim 2,
The computer device includes a valve control unit for opening and closing the electronic valve, fluid flow rate control;
A correction coefficient calculator for calculating the intrinsic linear correction coefficient of the fluid vibrating body;
And a storage unit for storing the calculated linear correction coefficients. The method according to claim 1,
Calculation of the intrinsic linear correction coefficient of the fluid vibrating body in the computer device,
The flow rate of the fluid vibrating body is passed, the flow rate set in the electronic valve, the cumulative flow rate set in the reference tank is calculated based on the standard hourly flow rate and the vibration frequency of the fluid vibrating body is calculated based on Measuring and compensating device for fluid vibrating flow measurement apparatus. Supplying fluid through a pipe in a fluid supply device;
Detecting the vibration frequency generated when the fluid supplied from the fluid supply device passes through the fluid vibrating body in the vibration frequency detecting device and transmitting the vibration frequency to the computer device;
Controlling the fluid passing through the fluid vibrating body to pass through at a flow rate set in the electronic valve;
Accumulating and storing the fluid passing through the electromagnetic valve in a reference tank;
Checking a cumulative amount of fluid in the reference tank by a level meter device and transmitting the detected signal to the computer device when the detected amount is detected;
Receiving the detection signal of the level meter device at the computer device to block the electronic valve;
Calculating a standard hourly flow rate determined by calculating time at which the intrinsic of the fluid vibrating body and the flow rate from the level meter device pass, the flow rate set in the electromagnetic valve, and the cumulative flow rate set in the reference tank; Wow,
Calculating an inherent linear correction coefficient of the fluid vibrating body based on the fluid vibration frequency generated when the fluid vibrating body passes through the computer device;
And storing the calculated intrinsic linear correction coefficient of the fluid vibrating body in a storage device in the computer device. delete The method according to claim 5,
Measurement correction method of the flow rate measuring device,
When constructing a flow rate measuring device including the fluid vibrating body, the flow rate measuring device searches for the intrinsic linear correction coefficient of the stored fluid vibrating body based on the vibration frequency of the fluid vibrating body in the computer device. Measurement and correction method of the fluid vibration type flow measurement device, characterized in that applied to.

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